[DO NOT MERGE] String executor 3 [5.7]#58648

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milseman wants to merge 2 commits intoswiftlang:release/5.7from

milseman:string_executor_3_5_7

Commits on Apr 29, 2022

string processing test
milseman
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Commits on May 3, 2022

DO NOT MERGE
milseman
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